Electronic calculator

Details Electronic calculator Electronic calculator

1980-12-11

1983-03-29

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

D1801

Patent

active

D02684233

REFERENCES:
patent: D223865 (1972-06-01), Anzai et al.
patent: D247391 (1978-02-01), Hazama et al.
patent: D260530 (1981-09-01), Yamasaki

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